Should I replace my logic board or get a new MacBook?

So for the past year my laptop has been having issues turning back on if it gets shut down completely (restarts are fine). After an event of it shutting down while I was on vacation and then not being able to turn back on, I took it to a repair shop just to see if they could diagnose the problem.

I had some hunch it was the logic board as I just replaced the battery a few months ago since the original one was at the end of its life, and the guy confirmed that my SMC on the logic board is no longer working and that is also why no amount of SMC resets seemed to solve my issue (even though that is googles common answer for my laptop problems).

Now I have 2 (3-ish) choices:

(1) to not replace the logic board and just never shut off my computer and hope it has enough life in it so I can save up for a new Macbook (and get myself a nice upgrade in doing so). With this, I would not put any more money in my macbook but I am estimating I need to save up $2500 because I will want more processing power, more space, and I will have to buy all new dongles. I am thinking I might be able to sell my current Macbook and hope for some money (so also if anyone has estimates on how much I could get for my mostly working laptop)

(2) to replace the logic board ($250+tools) and hope that it gives my laptop more life so I can continue to get my work done for a few more years no problem and then deal with buying a new computer the next time it starts to die.

OR, I guess the third option (3) , but more money is to do a combination where I try to replace the logic board on my computer and then with the (hopefully) extra time save money for a new computer over a longer period of time.

Keep in mind, I feel capable to replace a logic board but not necessarily confident enough in my skills to do a superb, fantastic job

Thanks in advance