can i use personal license for profesional purpose??

According to Unity's own website:

Unity Personal may not be used by:

1. a Commercial Entity that has either: (a) reached annual gross revenues in excess of US$100,000, or (b) raised funds (including but not limited to crowdfunding) in excess of US$100,000, in each case during the most recently completed fiscal year;

2. a Non-Commercial Entity (this means academic and governmental entities as defined below) with a total annual budget in excess of US$100,000 (for the entire Non-Commercial Entity (not just a department)) for the most recently completed fiscal year; or

3. an individual (not acting on behalf of a Legal Entity) or a Sole Proprietor that has reached annual gross revenues in excess of US$100,000 from its use of the Unity Software during the most recently completed fiscal year, which does not include any income earned by that individual which is unrelated to its use of the Unity Software.

Source: Here

depends.

if your company gain less than US$ 100k in the past year, yes, you can use the personal edition.

And, if yourr company's revenue are bigger than this, you have 2 options to use the professional version of the unity:

1. Plus: US$ 35 / month

2. Pró: US$ 125 / month

Compare the plans

Note, plus and pro are for companyes that reveue are below US$ 200k / year

And, for teams with 21 or more, you need the enterprise version, and you need to contact the unity team to ask for prices.

Contact for enterprize