Please do not take higher doses to see how high you can get. Like... in general ever. People wonder how anyone overdoses from oxycodone because it's so measurable in milligrams. Never forget that painkillers have killed more people than wars and outnumber COVID and car crashes. It's not worth finding your ceiling. Prolly being a funsucker here but you've got to really have confidence in your tolerance for it. You'll come to learn how precious the feeling is. It's better to salvage it than one power-go anyway imo.
There is a sweetspot for opioids personally. For instance... 30 milligrams is the sweetspot for me. It get's me comfortably euphoric. I'd still accept the lower doses (for free though).

The higher doses like 60-100 milligrams can almost result in dysphoria for me. The euphoria diminishes and it's actually a really negative experience where I have shallow breathing and paranoia. Some people don't seem to have a similar ceiling effect and constantly chase nods. There is no euphoria for me risking my life however. One reason I love opioids is because they don't make me intoxicated like booze and I can roam around like a normal person and pretend that I am not an addict. Higher doses make it difficult to not look stoned as hell around people (who would shame me).
It seems like you are developing a tolerance but I'd like to know how long you have been using for as well. This is the part where many people graduate to heroin only to find out that after a certain point getting higher is not the answer (and it's too late to turn back). You can purposefully put yourself through withdrawal. It's not ideal and it will be a miserable time but the magic does come back a bit. I HIGHLY suggest you do not keep trying to take more to achieve the same effect for a good number of reasons I won't bother listing in this post. I do know someone who deliberately throws themselves into withdrawal two days a week. At first when this person said this I did not understand why anyone on earth would do that.. but now it makes so much sense lol. This experience that you are having did happen to me actually too. It will go away here and there. Tolerance isn't simply explained by doses and timeline of use.. sometimes your body is hit harder by 10 milligrams of opioids than 40 milligrams. Not the most reliable buzz in the world just saying. It changes so frequently and that cannot be explained unless you calculated your metabolism in some way with advanced science teehee. Stick to lower doses for as long as you possibly can in my opinion. Stay safe.