Under 26 Skilled worker visa

[SMB10]

Hi All,

Can someone please advise for the below?

Recently home office have made a change in skilled worker visa. You can be paid 70% of your job’s usual going rate if one of the following applies:

you’re under 26 on the date you apply
you’re currently in the UK on a Student visa studying at bachelor’s degree level or above - or you have been in the last 2 years, and a Student or visit visa was your most recent visa
you’re currently in the UK on a Graduate Entrepreneur visa
you’ll be working towards a recognised qualification in a UK regulated profession
you’ll be working towards full registration or chartered status in the job you’re being sponsored for

Your total stay in the UK cannot be more than 4 years if you apply for one of above reasons. This includes any time you’ve already spent in the UK on a Tier 2 (General) work visa.

Now my question is, once I have completed my 4 years, do I have to leave the country? or I can apply for the skilled worker visa by meeting the annual going rate?

[SMB10]

Any advise please?