I found his contact here, requested the services I needed via Discord, and in less than 24 hours, he delivered what I asked for.
He farmed the aspects I needed, unlocked tier 4, and leveled up my character to 70. Additionally, he left plenty of legendary items and aspects that were not included in the package.
I highly recommend his work, both for the quality and speed with which he did it.
By the way, I made the payment via BTC. I can say it's 100% trustworthy.