If you have the budget and need more lanes for nvme, you could get a LSI HBA 9400 or 9500 series (or other pcie hba) + ToughArmor MB720M2K-B (m.2) or ToughArmor MB699VP-B(u.2) + the appropriate cables(see the recommended ones on the dock page).
This can turn 8 lanes of pcie to 16 (you’ll still be capped on bandwidth but will get more devices and if you arent slamming more then 8 lanes youll not notice the perf hit)
Not his is very not cost effective I have this set up on my home server and its over $200 in cables + $250+ in dock + $250+ in HBA , but you get a nice dock to hot swap if you need that ability and an HBA that can also be moved later to SATA/SAS later down the line.