Securing your Laptop on the go

I have a OpenBSD 7.9 with FDE setup on my laptop. In userspace I have
on /etc/apm/resume, xlock to lock the screen on resume. When I am on
the go, I keep my laptop in sleep mode for faster access. And I was
wondering if there any security holes with this setup? If an attacker
got my laptop, and wake it from sleep, will they be able get the
decrypted information from my storage or memory some way I do not
know of?

Both my FDE and user/root passwords have high entropy.

How would you secure your laptop on the go? If your threat model is 
is just theft and brute-forcing?