Your list is average (which is fine). However, you might be alpha-striked by some of those things : Primaris Hellblasters and Inceptors, Terminators with combi-plasmas, etc. (in short, anything that can deepstrike and/ or have S5+ ranged weapon with decent AP).
Since I don't have my codex with me it's hard to give advices, but I would recommend some Blightlords and a Nurgle Chaos Lord in termi armor to try to do some deep alpha strike behind enemy lines. Also, yeah, either you take Plague Marines in pack of 15-20, or you put them in a rhino / land raider. They're slow and have close-quarter weaponry, they might be outshooted from the beginning.
A common tactic that is being used is to take a lot of them (20) with a biologis so their grenades become hyper-efficient and that they can walk the whole distance while taking hits.
Another is to take 7 of them and put them with a biologie in a rhino / landraider.
Another tactic is to have a blob of 20 cultist in front of a blob of 20+ Poxwalkers, and when cultists die to use the stratagem that allows poxwalkers units to add new poxwalkers in their unit when something close to them die. Add Typhus to the lot and you can end up with a vast horde of resilient tarpit units.
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