I think other things they are learning from what has happened in Ukraine conflict.
They cannot come close to running out of missiles/bombs. You will see them ramp up purchases of PGMs, stand off missiles and probably BM/CMs to another level to make sure they do not come close to running low on missiles. That's one major lesson they've learnt from the Ukraine conflict.
Another lesson I think they will realize is that they need a lot of everything if they get into a war of attritions. So, I expect them to just keep building a lot of 052Ds, J-16s, H-6K/Js and UCAVs to make sure they have plenty of platforms that can launch missiles. I listed these platforms, because they are all great platforms that are not cutting edge for PLA. You need a lot of these platforms to win in battlefield. The strength of China's MIC is in its ability to mass produce things. They will make sure they have enough platforms to sustain a long conflict.
Another thing is that I think they have talked about making sure that they put their military in a position of having an advantage in every scenario. That would involve having more realistic training, more joint training, developing large numerical advantage and being prepared for every scenario.
Also, I think PLA wants to produce enough military hardware and develop enough operational advantage to make it really hard for US military to get involved. I know that
@Patchwork_Chimera says that PLA expects US military to get involved and will carry out first strike against US military. My impression is that they really don't want decoupling. They want to be able to tell the world that this is an internal matter, the conclusion of civil war rather than an invasion. As such, they will want to make the buildup look as unsuspecting as possible. They were able to do this recent exercise with just ETC involvement on a couple of days of notice. Just think what they could put out there with more planning/preparation and a lot more quantities of everything. That will allow them to position their PCH191 battalions without any suspicion. I personally think they will do everything under the guise of a major ETC exercise of many days that will first tire out Taiwanese air force and ships. Once that happens, they will turn it into a blockade with the help of STC and cutters. Keep in mind, Taiwan only has 7 days natural gas stored. It won't take very long for China to really squeeze Taiwan's economy and force Taiwan to try to break blockade through shooting war. Again, this could suddenly turn from an exercise to a shooting war in a couple of days. They don't want a Russian scenario where it was obvious for months that Russia was getting ready to attack. Then, it would be a really tough decision for any US president on what to do. I think this will be PLA's move to avoid an all out war.