Longboard: Fix or Replace?

New to the forums,
Background info:
(SKIP if you don't care about the technical stuff!)
Also I have no experience with fixing my board
2013- After a long time waiting to get a longboard I was finally able to get one. Loved it at first but 3 years later...
2016-
-Realized I tried to make a cruising/carving board with a bloody downhill board. This thing is heavy as hell and I just can't find myself riding on the sidewalk or having any proper mobility with this thing. I run it with loose trucks and abec flywheels 78a I believe (built it awhile ago, so I really don't remember the parts). This thing can tackle hills pretty well but I find myself pumping alot with little acceleration on flat roads. The board is a top mounted, stiff bustin board.
-Front truck can't be tightened. Whenever I try to tighten I end up just moving the bushing and the nut instead of just the nut. Only way around is take the truck off and wedge a rock or something to move it. Kinda hard to explain so I'll upload pictures later.
-Road is feeling a bit rough. I did get heavier since 2013 which I suspect may be a problem but I really don't know (hence why I'm on a forum). Board is quite stiff aswell. I didn't notice this back in 2013 because I simply just wanted to ride, I really didn't care for any personal preference.
So truly I just want to make my board ride smoothly, and pump as little as possible, and handle hills with descent control. I'm completely stuck on what I should upgrade/replace/buy/??? so I turn to the people on this forum to give me aid.
Also kinda on a tight budget so the stuff I'll be purchasing will be part by part.
Please ask any question and links would be quite helpful as well!
*Please tell me if I posted this in the right section/did anything I wasn't suppose to do on the forums.
Thanks!
Background info:
(SKIP if you don't care about the technical stuff!)
Also I have no experience with fixing my board
2013- After a long time waiting to get a longboard I was finally able to get one. Loved it at first but 3 years later...
2016-
-Realized I tried to make a cruising/carving board with a bloody downhill board. This thing is heavy as hell and I just can't find myself riding on the sidewalk or having any proper mobility with this thing. I run it with loose trucks and abec flywheels 78a I believe (built it awhile ago, so I really don't remember the parts). This thing can tackle hills pretty well but I find myself pumping alot with little acceleration on flat roads. The board is a top mounted, stiff bustin board.
-Front truck can't be tightened. Whenever I try to tighten I end up just moving the bushing and the nut instead of just the nut. Only way around is take the truck off and wedge a rock or something to move it. Kinda hard to explain so I'll upload pictures later.
-Road is feeling a bit rough. I did get heavier since 2013 which I suspect may be a problem but I really don't know (hence why I'm on a forum). Board is quite stiff aswell. I didn't notice this back in 2013 because I simply just wanted to ride, I really didn't care for any personal preference.
So truly I just want to make my board ride smoothly, and pump as little as possible, and handle hills with descent control. I'm completely stuck on what I should upgrade/replace/buy/??? so I turn to the people on this forum to give me aid.
Also kinda on a tight budget so the stuff I'll be purchasing will be part by part.
Please ask any question and links would be quite helpful as well!
*Please tell me if I posted this in the right section/did anything I wasn't suppose to do on the forums.
Thanks!