I’ve had a look at your roster and if it were mine, here’s what I would do.
1) Buy RagLoki, Shuri , QS, IW Dr. Strange/AoA Wolverine uniforms right away. This is assuming you’re actively working to complete both Epic Quests within the next month. Hold out for a bit on Sharon Rogers as she’s allegedly got a new uni on the way.
2) Buy IW Ironman, IW Thor, IW Spidey, IW Black Widow, IW War Machine & AntiVenom uniforms. The above characters cost half the regular quantity of materials for rank ups and can be advanced to Tier 2 very quickly. Also buy RagnaHulk, IW StarLord & Wasp uniforms and try to advance them all asap.
3) Plan towards acquiring Magneto, then BP/Psylocke packs with what’s left and at your convenience.
I suggest you let SW and Thanos unis go for now as they are a huge resource sink and you could go a lot farther in Shadowland (your immediate long term goal, I imagine) investing them elsewhere.
Hope this helps.
I'm in the same boat. I was hoping they'd be on sale. Besides the ones you mentioned I'm looking at Hela (for the eventual CTP), Loki, Ragna Hulk, and Hulkbuster. I'm staying away from Cap, Widow, and Spidey because with Avengers 4 next year (and Spidey movie) you already know they'll get new unis then