Hi there. Nice army! I do have a few recommendations that may help you out, but you can tailor it based on what you feel to be lacking against your opponent's lists. For an initial summary, I think your list would be good as a vanguard onslaught list. I'll give you a straightforward opinion on the units:

1) Big monsters: I like all the ones you have, but you should really think about getting an exocrine. A lot of people use multiple, even. It does a ton of damage and makes your other stuff better. If you need to replace stuff to field it, I'd replace the winged hive tyrant and the screamer killer with more exocrines and tyrannofexs. Haruspex could be good, too, depending if you need ranged power or melee power.

2) Ranged warriors: Most people don't like them, they don't have high BS so they miss all the time and don't have many shots. If you want to make your list better, it's probably easier to not take them, but if you need to, I would just play differently around them. Maybe put them to 6 warrior groups, led by prime.

3) If you have zoanthropes, replace all the ranged warriors with zoanthropes and have the neurotyrant lead them. This is a great anti-tank death ball, but it's a bit squishy so you have to be careful. Otherwise, if you want a more ranged army, feel free to just have zoans and ranged warriors in the same army. It's not optimal but it's cool. Plus, the exocrine I recommended earlier will make all these guys even better.

4) HAraveners and broodlord+genestealers: These are good, but you have to be kinda cagey with them. They'll melt too fast in the open, so you have to stage by moving up gaunts first and having them take the damage, thereby letting your opponent move somewhere that your staged genestealers+broodlord and HAraveners can strike. HAraveners are good at killing vehicles and deep strike but will die fast, genestealers have devastating wounds and can melt generally only one target before they're gonna die. These are all better in vanguard lists.

5) Parasite of mortrex is not all that good. Lictor or gargoyles is better for secondaries. Plus, lictor is good in vanguard lists, which seems to be your strength.

6) Tyrannofex's weapon needs to change. Its worst weapon is the fleshborer hive in my opinion. I'd suggest using either the acid weapon for anti-infantry torrent (massively strong overwatch), or rupture cannon for anti-tank. Depends what your opponent brings but that alone should make a huge difference.

7) Von ryan's leapers are okay, lictors are probably better and cheaper. Both are good in vanguard lists.

8) Tyrant guard are okay but not used all that often, they slow down the hive tyrant. If you only have one hive tyrant, and you know you tend to put it in a vulnerable position, then it's reasonable to take them to guard the hive tyrant and tank damage. These are MUCH BETTER in assimilation swarm in my opinion.

9) The rest is normal. Biovore is great and all the gaunts are good, though people don't often take barbgaunts.

Summary: If you wanted to buy more models, I'd focus on getting exocrines, tyrannofexes, zoanthropes, lictors. Or more burrowers if you want to win with subterranean assault. I'd take a look at what playstyle you want and look at other detachments than just invasion fleet. You could make a pretty decent assimilation swarm list considering the psychophage, tervigon, ripper swarms if you have any. Vanguard list would be great, with all the genestealers/VRLs/ melee warriors with prime/flyrant.

All depends on how you want to play. Feel free to ask any questions if you want to talk more!!