Vegas is rolling rn and i think jacobs will be top 5 RB this year, could even argue top 3 with Mcaffrey and Saquon hurt. Would sit pat with him.
Second trade: I worry about you losing your WR2 for someone that can only POTENTIALLY upgrade your team. Last year Lamar was a fantasy cheatcode, this year he’s still top tier but hasn’t busted out a monster game like he did several times last year (granted only 2 games worth of data so far). I think due to your lack of WR depth, you can’t afford to make this trade, unless you FULLY believe that Lamar is going to replicate even 90% of what he did last year. You do have Brown which would help with the stack, but so far Brown has only been mediocre.
Third trade: i think this is the one that is most likely in your wheelhouse. Bell is hurt and wouldn’t crack anything besides your flex with Mixon and Jacobs in the 1 and 2, and as long as you can hold onto Gibson you have a bye-week filler. Hopkins will step in and immediately take over your WR1 spot, Moore in the 2, and Gesicki will be a good boom/bust TE over Hurst.
TLDR; i’d do trade 3 if you can push Juedy > Gibson. You need the RB depth if your already giving up bell for bye-weeks.