@OxOnFord and @Ezmyrelda have excellent suggestions - the first being quick, easy, and very little side tripping on your workflow, while the second allows for your modulations to be in a different repetition (2 bars for the Note loop and perhaps 5 bars for filter shifts, etc).
A third option I’d suggest would be specifically if you wanted to modulate the MIDI Fx. Since the only (I think) MIDI Fx that works on a separate channel is the MIDI LFO (other MIDI Fx must be on the Track your Note data is on), you can always set up a Track to send out to a MIDI Loopback to control the MIDI Fx on your original Track.
For example, you have a MIDI Delay set on your 8 bar Track but want the Delay to modulate over 5 bars. You can set up a second Track of 5 bars, send a MIDI CC, have the MIDI Delay on the original Track modulated by the CC data on the second Track.
I’d say that’s a more advanced approach, but I use Loopbacks regularly just because it’s easier for me to think in separation of Notes and Modulations sometimes. I can type a clearer step-by-step setup for it if you’d like, but I assume like most this technique is probably ‘too much hassle’.