If you use a VPN, you can have slow network it depends only of the vpn you're using, some are fast some are slow.
In france I have 1000/600, and when I use the company vpn for work at home I have only 100/100.
If you still have trouble not using the Vpn , take a look of the cpu utilisation (%) if it's goes 100% cpu is old or software taking too much ressources.
Check cable also, and maybe the networking card (cable or wifi) some laptops using 100M cards ; Also wifi 2.4Ghz you get max 150M, try using wifi 5Ghz (if you can) for better speed but worst range
I use internet download manager since 10 years now

and (6 cores i5-10600k) and at full speed it goes only at 10%, in the meantime chrome/firefox and other using speedtest : cpu goes at 70% at lower speed

=> also on steam 80% of cpu
Ps in France : 30€=25$/month for 1000/600 and even 4000/1000 for 50$/month