www.teamretro.com tracks prior retrospective feedback and even captures all previous retros. The actions can be seen at any time, as well as team agreements. If you like to see history, you can also record and see team health checks as well as all your retrospectives can see it. The team dashboard is good for that too. There is a 30 day free trial.
www.groupmap.com lets you create workspaces to keep track of your retros too so that's worth checking out.
I've always like the idea of the Eisenhower Matrix (Urgent/Important), but it never quite worked for me because a lot of clutter ends up in the non-important/non-urgent quadrant, and then i don't revisit it and things sneak up on me: https://www.groupmap.com/map-templates/urgent-important-matrix/
But this could work for OP.
So for my retrospectives, I always invite the product owner into them, do you currently have sprint cycles or any Scrum practices in place?
A good start for introducing retrospectives is the Stop,Start, Continue
This format is useful in collating all opinions from the team and gather what they feel is holding them back, things that would improve their way of working and stuff that is working well and we should totally catty on doing.
Some blogs... https://www.mountaingoatsoftware.com/blog/a-simple-way-to-run-a-sprint-retrospective
https://www.groupmap.com/map-templates/start-stop-continue-retrospective/
If you are co-located, I'd recommend to go through each section and give post-it notes to each team member and let them write everything down individually.
Be sure to encourage that this is a safe place and that everyone can openly speak their mind. Without it, the team will never change or be open with eachother.
A useful resource is retromat. This will allow you to build multiple custom retrospectives and also give you huge amounts of reading material. https://retromat.org/en/
I'd recommend www.groupmap.com for facilitated brainstorming and customised online workshops. Great for working through things in order and lots of customized features when it comes to running a team workshop. Been really important when it comes to working remote and having a collaborative meeting tool that is a bit more structured.
For remote retrospectives, www.teamretro.com is awesome. Really easy to use, not distracting and allows you to integrate your action items in to Jira amgst others. Simple and straight forward but still powerful in terms of being able to track history, create anonymous brainstorms and add reactions to ideas.
On top of a to do list (I write this in my diary throughout the day), I find the urgent/important matrix helpful for prioritising. Stops me from turning up and doing a bunch of easy, but not really vital tasks which can give you a sense that you're being productive when you're kinda not.