loveoldtrux
If you're experiencing speed issues it has absolutely nothing to do with the expiration of promotional pricing. The two happening around the same time are pure coincidence.
But, regarding it taking 1.5 hours to download 1GB, the tool you're using to gauge that rate isn't at all accurate in that way, as there is no context and no breakdown. Are you downloading a single file that's 1.5GB or larger in size, and if so, from where, as servers at the source can have problems (Windows and Apple often do)? Are you downloading multiple files that add up to 1.5GB or larger in size, and again, if so, from where? The only way speed/throughput can be gauged is when something is downloaded that is enough to cause the speed to go to as high as it can for a long enough time to get an accurate result. A speed test does this.
Glasswire is a much used and often recommended tool for showing data usage in a given time period, including what's using it. https://www.glasswire.com/ That's for the data. For measuring speed itself you should use testmy.net, and use the manual 25MB test size for download tests and the manual 4MB test size for upload tests.
Having to buy the mentioned Tokens, OTOH, is because of exhausting your monthly allotment of high speed data too quickly and having the speed throttled because of it. Token data doesn't affect your speed/throughput in any other case. Only when you've exhausted your high speed data allotment and have gone into FAP. And, actually, if anything, a reduced data throughput, other than when in FAP, would mean your monthly allotment of high speed data would last longer, not the other way around. But, again, the tool you're using to measure your throughput/speed isn't accurate for that purpose.